CN102248044B

CN102248044B - Method for bending rear crossbeam of heavy truck and bending die

Info

Publication number: CN102248044B
Application number: CN201110148171.5A
Authority: CN
Inventors: 和爱华; 王鹏刚
Original assignee: China National Heavy Duty Truck Group Jinan Power Co Ltd
Current assignee: Sinotruk Jinan Power Co Ltd; China National Heavy Duty Truck Group Jinan Power Co Ltd
Priority date: 2011-06-03
Filing date: 2011-06-03
Publication date: 2014-03-12
Anticipated expiration: 2031-06-03
Also published as: CN102248044A

Abstract

The invention relates to a method for bending a rear crossbeam of a heavy truck. The method comprises the following steps that: a bending die which is debugged to be qualified is arranged on a press; two positioning holes on a punched blank pass through two positioning pins on the upper surface of an ejector so that the blank is placed on the ejector of a lower die of the bending die; and a working pushbutton of the press is pressed so that a male die of the bending die moves downward along with a sliding block of the press, the bending force acts on the blank in a direction vertical to the horizontal plane, and the blank is pressed by the bending force and the ejector of the bending die so as to move downward and enter a cavity of a female die of the bending die, the sliding block of the press moves downward to the bottom of the female die of the bending die, the blank is formed in the female die of the bending die, the sliding block of the press moves upward, the ejector of the bending die, a bent part and the male die of the bending die synchronously move upward to the position before bending, the male die of the bending die and the bent part are separated, and the wing surface and the bottom surface of the rear crossbeam are in an ideal state due to the rebound of a steel plate. Meanwhile, the invention also discloses the bending die matched with the method.

Description

The bending method and the bending mould that heavily block rear cross beam

Technical field

The present invention relates to a kind of vehicle part processing method and mould, especially a kind of bending method of heavy card rear cross beam and bending mould.

Background technology

It is 90 ° that the rear cross beam of heavy hauler requires an aerofoil and bottom surface angle, another aerofoil and bottom surface angle a are greater than the irregular U-shaped part of 90 °, two aerofoil height are greater than 250mm, its material adopts high-intensity frame beam steel plate, expect thick 6 to 10mm, conventionally bend mode is: curved hairs blank lies in a horizontal plane on the ejector of bending mould, and when crooked, bending force is vertical with the bottom surface of crossbeam.Because rear cross beam is irregular U-shaped part, two aerofoils are stressed asymmetric, cause two aerofoil resiliences to vary in size, die debugging difficulty, and resilience is difficult to control and is serious, thereby affects assembling beat and the complete vehicle quality of vehicle frame.

Summary of the invention

The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of simple structure is provided, and debugging is convenient, can be the stressed symmetry of two aerofoils of processed rear cross beam, resilience reduces and is easy to control, improves the bending method that heavily blocks rear cross beam and the bending mould of complete vehicle quality.

For achieving the above object, the present invention adopts following technical proposals:

A bending method for heavy card rear cross beam, comprises the following steps:

1). the qualified bending mould of debugging is contained on forcing press;

2). two locating holes on the blank of the punching that falls are penetrated in two alignment pins on ejector upper surface, be placed on the ejector of bending mould counterdie; Described blank becomes b degree angle to be placed on the ejector of bending mould with horizontal plane, b=(a-90 °)/2 wherein, and a is rear cross beam is greater than the angle of 90 ° between an aerofoil and bottom surface;

3). press forcing press play button, the punch of bending mould is descending with press ram, bending force with the directive effect perpendicular to horizontal plane in blank, compress in the die cavity of the die that is advanced into bending mould under blank with together with the ejector of bending mould, press ram comes downwards to the die bottom of bending mould, blank is shaped in the die of bending mould, and the angle of two aerofoils and bottom surface is slightly less than product requirement angle;

4). subsequently, press ram is up, and the punch of the ejector of bending mould, brake forming part and bending mould goes upward to crooked front position simultaneously, and the punch of bending mould is separated with brake forming part, press ram goes upward to the top dead-centre of forcing press, out of service; Due to steel plate resilience, make the aerofoil of rear cross beam become to reach perfect condition with bottom surface.

A kind of bending mould of heavy card rear cross beam, comprise the upper die and lower die that match, patrix bottom is provided with the punch matching with rear cross beam to be processed, in counterdie, be provided with the die corresponding with punch and run through up and down the ejector of die, ejector lower end is connected with push rod, the upper surface of described ejector is for becoming the inclined plane of b degree angle with horizontal plane, b=(a-90 °)/2 wherein, and a is rear cross beam is greater than the angle of 90 ° between an aerofoil and bottom surface.

The upper surface of described ejector is provided with two alignment pins that upwards arrange.

Compared with prior art, the present invention is by changing the placement direction of curved hairs blank, curved hairs blank is become b angle be placed on the ejector of mould (wherein b=(a-90 °)/2) with horizontal plane, bending force with the directive effect perpendicular to horizontal plane on blank, after being shaped, two aerofoils and horizontal plane angle are complementary, and stressed symmetry reduces die debugging difficulty, make resilience minimizing and easy to control, improve complete vehicle quality.

Accompanying drawing explanation

Work schematic diagram when Fig. 1 is rear cross beam bending of the present invention;

Fig. 2 is rear cross beam bending die sketch of the present invention;

Wherein: 1, blank, 2, brake forming part, 3, locating hole, 4, bending direction, 5, ejector, 6, alignment pin, 7, die, 8, patrix, 9, counterdie, 10. push rod, 11. punch.

The specific embodiment

Below in conjunction with drawings and Examples, the present invention is further described.

As shown in Figure 1 and Figure 2, a kind of bending method of heavy card rear cross beam, comprises the following steps:

1). the qualified bending mould of debugging is contained on forcing press;

2). two locating holes 3 on the blank 1 of the punching that falls are penetrated to two alignment pins 6 that arrange on ejector 5 upper surfaces, be placed on the ejector 5 of bending mould counterdie 9; Described blank 1 becomes b degree angle to be placed on the ejector 5 of bending mould with horizontal plane, b=(a-90 °)/2 wherein, and a is rear cross beam is greater than the angle of 90 ° between an aerofoil and bottom surface;

4). press forcing press play button, the punch 11 of bending mould is descending with press ram, bending force with the directive effect perpendicular to horizontal plane in blank 1, with together with the ejector 5 of bending mould, compress blank and be advanced into for 1 time in the die cavity of die 7 of bending mould, press ram comes downwards to die 7 bottoms of bending mould, blank 1 is shaped in the die 7 of bending mould, and the angle of two aerofoils and bottom surface is slightly less than product requirement angle;

5). subsequently, press ram is up, and the punch 11 of the ejector 5 of bending mould, brake forming part 2 and bending mould goes upward to crooked front position simultaneously, and the punch 11 of bending mould is separated with brake forming part 2, press ram goes upward to the top dead-centre of forcing press, out of service; Due to steel plate resilience, make the aerofoil of rear cross beam become to reach perfect condition with bottom surface.

A kind of bending mould of heavy card rear cross beam, comprise the patrix 8 and the counterdie 9 that match, patrix 8 bottoms are provided with the punch 11 matching with rear cross beam to be processed, in counterdie 8, be provided with the die corresponding with punch 11 7 and run through up and down the ejector 5 of die 7, ejector 5 lower ends are connected with push rod 10, the upper surface of described ejector 5 is for becoming the inclined plane of b degree angle with horizontal plane, b=(a-90 °)/2 wherein, and a is rear cross beam is greater than the angle of 90 ° between an aerofoil and bottom surface.The upper surface of described ejector 5 is provided with two alignment pins 6 that upwards arrange.

The present invention is by changing the placement direction of curved hairs blank 1, curved hairs blank 1 is become b angle be placed on the ejector 5 of bending mould (wherein b=(a-90 °)/2) with horizontal plane, bending force with the directive effect perpendicular to horizontal plane on blank 1, after being shaped, two aerofoils and horizontal plane angle are complementary, stressed symmetry, reduce die debugging difficulty, make resilience minimizing and easy to control, improve complete vehicle quality.

Claims

1. heavily block a bending method for rear cross beam, it is characterized in that, comprise the following steps:

1). the qualified bending mould of debugging is contained on forcing press;

2). two locating holes on the blank of the punching that falls are penetrated in two alignment pins that arrange on ejector upper surface, be placed on the ejector of bending mould counterdie; Described blank becomes b degree angle to be placed on the ejector of bending mould with horizontal plane, b=(a-90 °)/2 wherein, and a is rear cross beam is greater than the angle of 90 ° between an aerofoil and bottom surface;

2. a bending mould that heavily blocks rear cross beam, it is characterized in that, comprise the upper die and lower die that match, patrix bottom is provided with the punch matching with rear cross beam to be processed, in counterdie, be provided with the die corresponding with punch and run through up and down the ejector of die, ejector lower end is connected with push rod, and the upper surface of described ejector is for becoming the inclined plane of b degree angle with horizontal plane, b=(a-90 °)/2 wherein, a is rear cross beam is greater than the angle of 90 ° between an aerofoil and bottom surface.

3. the bending mould of heavy card rear cross beam as claimed in claim 2, is characterized in that: the upper surface of described ejector is provided with two alignment pins that upwards arrange.